Portable telephone



FIG. 1 is a top perspective view of a portable telephone showing my new design;

FIG. 2 is a front on view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict unclaimed portions of the graphical user interface, which form no part of the claimed design. 

CLAIM I claim the ornamental design for a portable telephone, as shown and described. 